Hey hows it going, so I have run into a new issue that I haven't had.
My fuel pump will run with key on engine off,
As you know, that would be against USCG and inner water way regs.
but once the engine is started the pump doesn't run.
Just got done changing the oil pressure safety switch and the ignition switch, and all is wired correctly. Not sure why the pump isn't on with engine running. Any advice is helpful, thanks.
As Ed suggested, the pressure switch will be a N/O style. (N/O = normally open at below 4 or 6 psi)
The fuel pump's circuit will be OPEN in the absence of engine oil pressure, and will be closed with the presence of engine oil pressure.
The start-bi-pass circuit operates the fuel pump (or fuel pump's relay) until engine oil pressure is achieved.